Can I use this product in a shower or a foot bath, or is it strictly for full baths?

The product is designed and dosed for a full bath, where the 400 ml bottle provides multiple uses when adding the recommended amount to a tub of warm water. However, you can certainly use a proportionally smaller amount—such as a capful or two—in a basin for a foot soak, especially after long walks or outdoor activity, to get the same aromatic benefits for tired feet. For a shower, you could add a few drops to a washcloth or a shower floor (away from direct water spray to avoid rinsing it away too quickly) to create a steamy, forest-scented atmosphere. Just be cautious, as essential oils can make surfaces slippery. The key is that the formula works by dispersing in warm water and releasing its aroma; any method that allows that to happen can work, though the full immersion of a bath is ideal for the intended experience.